obspy/obspy

Hello, I'm trying to process seismic data from MASW using the SWPROCESS library, it intrinsically uses some obspy libraries. Following the tutorial on the page, which loads a series of .dat data in SEG2 format separated by offset, I am not successful in inverting my data. I've already tried to use my data in SEG2, SEGY and SU format and still no success. With that, my last attempt was to try with the SEG2 format named the same as the one in the tutorial. However, I get the following error:

# Path (relative or full) to a folder containing the data files. Data files must be in either the SEG2 and/or SU data format.
path_to_folder = "data/wghs/"

set0 = [f"{path_to_folder}{x}.dat" for x in range(6, 7)]
fnames_set = [set0]
print(fnames_set)
for set_number, fnames in enumerate(fnames_set):
    print(f"  set{set_number} includes {len(fnames)} files from {fnames[0]} to {fnames[-1]}")

names = None

workflow = "time-domain"

transform = "fdbf"

fmin, fmax = 3, 100

vmin, vmax, nvel, vspace = 100, 500, 400, "linear"

fdbf_weighting = "sqrt"

fdbf_steering = "cylindrical"

snr = True

noise_begin, noise_end =  -0.5, 0.
signal_begin, signal_end = 0., 0.5

%matplotlib qt5
settings = swprocess.Masw.create_settings_dict(workflow=workflow,
                                               trim=trim, trim_begin=trim_begin, trim_end=trim_end,
                                               mute=mute, method=method, window_kwargs=window_kwargs,
                                               transform=transform, fmin=fmin, fmax=fmax, pad=pad, df=df,
                                               vmin=vmin, vmax=vmax, nvel=nvel, vspace=vspace,
                                               weighting=fdbf_weighting, steering=fdbf_steering,
                                               snr=snr, noise_begin=noise_begin, noise_end=noise_end,
                                               signal_begin=signal_begin, signal_end=signal_end,
                                               pad_snr = pad_snr, df_snr=df_snr)


start = time.perf_counter()
wavefieldtransforms = []

for fnames in fnames_set: 
    wavefieldtransforms.append(swprocess.Masw.run(fnames=fnames, settings=settings))
    print(wavefieldtransforms)

end = time.perf_counter()
print(f"Elapsed Time (s): {round(end-start,2)}")

From that I get the following error:

Could anyone help me to solve this problem? I would be extremely grateful!